Mode of and means for renewing the filaments of electric incandescent lamps



(No Model.) 2 Sheets-Sheet 1.

G. A. FREI.

MODE 0? AND MEANS FOR RBNEWING THE PILAMENTS 0F ELECTRIC INCANDESGENT LAMPS.

No. 499,916. Patented June 20, 1893.

(No Model.) 2 Sheets-Sheet 2.

G. A. PREI.

MODE OF AND MEANS FOR RENEWING THE PILAMENTS 0P ELECTRIC INGANDESGENT LAMPS.

No. 499,916. Patented June 20, 1893.

NITED STATES PATENT OFFICE.

GUSTAV A. FREI, OF SPRINGFIELD, MASSACHUSETTS.

MODE OF AND MEANS FOR RENEWING THE FILAMENTS OF ELECTRIC INCANDESCENT LAMPS.

SPECIFICATION forming part of Letters Patent No. 499,916, dated June 20, 1893.

Application filed November 14, 1892. Serial Ila-451.925. (N model.)

To aZZ whom it may concern.-

Be it known that I, GUSTAV A. FREI, a citizen of the United States, residing at Springfield, in the county of Hampden and'State of Massachusetts, have invented new and useful Improvements in the Mode of and Means for Renewing the Filaments of Electric Incandescent Lamps, of which the following is a specification.

- ment.

This invention relates to a new mode of, and improved means for, uniting filaments to the leading-in wires of electric incandescent lamps the same particularly appertaining to the renewal or replacement in the lamps of the filaments which have been burned out or destroyed. Y

The invention, so far as it resides in the method, consists in encircling the end portions of the filaments by the end portions of metallic joint tubes, uniting the joint by immersing the parts in a hydrocarbon, as naphtha, and passing an electric current through the tubes and proximate filament extremities, raising these parts to incandescence and taking thereupon a uniting hydrocarbon deposit,

opening the bulb of the lamp, insuring the removal of the old filament from the leading-in wires, placing the other end portions of the joint tubes to surround the extremities of the leading-in wires, then pinching the tubes and finallyexhausting the air and closing the bulb.

The invention as concerned in and by the means will be hereinafter fully described and pointed out in the claims.

In the acoompanyingdrawings the manner of and means for carrying out this invention are illustrated, in which- Figure 1 is a perspective view of the device herein termed the temporary mount. Fig. 2 is a view of one of the joint tubes. Fig. 3 is a perspective view which illustrates the act of placing the joint-tubesin engagement upon the temporary mount, and Fig. 4 is a perspective view illustrating the next step, that is, the engagement of the filament with the mounted joint-tubes. Fig. 5 is in, part a side, and in part a sectional, view of and through the temporary mount, the joint tubes and fila- Fig. 6 is a perspective view showing a modification in the form of the temporary mount. Fig. 7 is a plan view of the temporary mount, joint tubes and filament and the short-circui'ting clamp in combination with which said parts are temporarily placed. Fig. 8 is in part a side view and in part a sectional view showing the filament and tubes with the joint between them completed. Fig. 9 is a perspective view of the opened lamp and the filament and connected joint tubes shown as being connected with the leading-in wires.

The temporary mount, A, consists ofa small piece or fiat body, a, of non-conducting material, as vulcanized fiber, provided with two receivers for the joint tubes, B. The receivers may consist of pins, 12,12, suitably connected with the body by being driven into it and projected from the edge thereof, as seen in Figs. 1, 3, 4 and 5,w'ith which pins the joint tubes may, by their end portions, have encircling engagements,or the receiver may consist of the sockets, b b as seen in Fig. 6, into which the joint tubes, as to portions of their lengths only, may have temporary supporting engagements. The mount also has the handle-stem, d, projected'from its edge opposite the receivers.

The metallic collars or tubes, B, B, are placed in engagement with the receivers of the temporary mount and the filaments f, then have their ends inserted in the open ends of the tubes; and in practice it is often desirable to wedge them in with short pieces of carbonized substance such as that of which the filaments are composed. The temporary mount with the supported joint tubes and filaments engaged therewith, as seen in Fig. 5, are now placed into a short circuiting device or clamp which is then immersed intoa hydrocarbon or table, m, on which a filament may be supported with the tube-engaged ends thereof projected therebeyond, a clamp-bar, 7113, for confining the filament firmly againstlat'ransverse electrical conducting bar, m a pair of insulated contactepieces, n, 'n, arranged in a transverse line at a short distance from the aforesaid transverse conductor, m and electrical conductors, m leading to the one; and from the other of said contact-pieces. The clamp is of such size and so formed that as the temporary mount, A, is laid thereupon the tubes and filaments may have the disposition seen in Fig. 7, the end portions of the tubes next to the edge of the mount body, a, lying outside of and in contact with the aforesaidcontact-pieces, man, being firmly held by the clamping arms, 0, 0. The clamp-supporting body, m and the table-end are of nonconducting material such as vulcanized fiber or rubber, and the clamping-arms are suitably insulated from each other and so that they 1 may form n0 circuits. The current, passed through the parts clamped as described and immersed in the hydrocarbon,'raises the parts atthejoint toiucandescence theytakingthereupon a cementing or uniting deposit of carhon, as indicated at m, in Figs. 8 and 9. The clamping-arms being suitably opened, the temporary mount is taken from the clamp, carrying with it the filament and tube jointed thereto, which parts are removed from. the temporary mount, and, by suitable pinchers or other implement, are carriedwithin the bulb of the electric lamp, as seen in Fig. 9,

(which lamp as understood,has beenopened,

and from which the removal of the old filament has been insured;) and theeud portions of the joint tubes, the farther from the consnectiou therewith of the filament ends, are placed over the leading-in wires and engaged therewith by pinching them on.

In Fig. 9 a form of double pinchers is-shown which may be advantageously employed to engage the tubes at both of the filament ends,

but as the construction and mode of operation thereof are manifest upon an iuspectionof the drawings andas the device constitutes no part of this invention, and as also other devices for this purpose might be employed, a detailed description thereof will be unnecessary;

The temporary mounts, as will have become manifest by theforegoing, are devicesof great utility and advantage in the renewal of the lamps by the mode herein described.

I claim- 1. The improvement in the method of renewing the filaments of electric incandescent lamps which consists in encircling the end iport-i'ous of'the filaments by the end portions of metallic tubes, uniting the joint by immersing the parts in hydrocarbon and passing an electric current through the tubes and .proximate filament extremities raising these parts to incandescense and taking thereupon uniting hydrocarbon deposit, opening the bulb of thelamp', insuring the removal of the l old filament from the leading-in wires, placing the other ends of the aforesaid tubes to zsurround the extremities of the leading in wires, then pinching the tuhes and finally exhausting the air and closing the bulb.

f forth, comprising a. body of insulating material provided with two receivers for theend portions of joint tubes, substantially as de- .1 scribed. I

3. The combination witlra short circuiting device comprising a rest for the filament and a couductoradapted to-be:contacted on by two insulated: contact-pieces each having an electric conductor connected theretoro-f a-temporary mount consisting of a non-conducting body having receivers for the joint tubes whereby when the mount isin the clamp the tubes may bear against said contact-pieces", substantially as and for the purposes set forth. 4. A temporary mount for the. purpose *hereirn set. forth consisting of'a body 0t nonconducti-ng material with two receivers for "thejoiut tubes and a handle-stem, substantially'as described and: for therpurposehereiu j explained. J .5. The temporary mount for the purpose herein set forth, consisting of a body of nonconducting materiat provided with. the projecting pins, b,, b, andthe handle-stem, substantially as described.

GUSTAV A. FREI.

Witnesses:

WM. S. BELLOWS,

H. A. CHAPI-N.

the filament near bothtlre ends thereof, and

2. The mount for the purpose. herein set 

